ローカルホストにデプロイしようとしたときエラー

gistfile1.txt

macmini:myapp tyamuro$ cap deploy
    triggering load callbacks
  * 2012-11-12 17:13:57 executing `staging'
    triggering start callbacks for `deploy'
  * 2012-11-12 17:13:57 executing `multistage:ensure'
  * 2012-11-12 17:13:57 executing `deploy'
  * 2012-11-12 17:13:57 executing `deploy:update'
 ** transaction: start
  * 2012-11-12 17:13:57 executing `deploy:update_code'
    executing locally: "git ls-remote git@github.com:tyamuro/myapp.git HEAD"
Enter passphrase for key '/Users/tyamuro/.ssh/id_rsa':
    command finished in 12603ms
  * executing "git clone -q git@github.com:tyamuro/myapp.git /Users/tyamuro/ac_staging/releases/20121112081409 && cd /Users/tyamuro/ac_staging/releases/20121112081409 && git checkout -q -b deploy 53a1068d4f2a521c9d84d53fd7a756f99ce4eda1 && (echo 53a1068d4f2a521c9d84d53fd7a756f99ce4eda1 > /Users/tyamuro/ac_staging/releases/20121112081409/REVISION)"
    servers: ["localhost"]
Password:
    [localhost] executing command
 ** [localhost :: err] Permission denied (publickey).
 ** [localhost :: err] fatal: The remote end hung up unexpectedly
    command finished in 3395ms
*** [deploy:update_code] rolling back
  * executing "rm -rf /Users/tyamuro/ac_staging/releases/20121112081409; true"
    servers: ["localhost"]
    [localhost] executing command
    command finished in 57ms
failed: "sh -c 'git clone -q git@github.com:tyamuro/myapp.git /Users/tyamuro/ac_staging/releases/20121112081409 && cd /Users/tyamuro/ac_staging/releases/20121112081409 && git checkout -q -b deploy 53a1068d4f2a521c9d84d53fd7a756f99ce4eda1 && (echo 53a1068d4f2a521c9d84d53fd7a756f99ce4eda1 > /Users/tyamuro/ac_staging/releases/20121112081409/REVISION)'" on localhost